Mosmatic are good, but if I were to run just one swivel I'd put it at the boom between the bay hose and swivel saver. They last a lot longer there without the wear from being pulled on sideways like they do at the gun, plus they get really beat up and ugly at the gun. I just use a brass Adams swivel at the gun. There's probably something better, but I take the Adams apart and put marine grade wheel bearing grease in it and they last a couple years and swivel easily.